Casing slip



April 5,19'27. 1,623,885

G. A. MONTGOMERY CASING SLIP Filed April 21', 1926 2 Sheets-Sheet 1 lNvENToR Gustavus lflam owor'y ATTORNEYS WITNESSES G. A. MONTGOMERY "April 5, 1927'. 1,623,885

casme SLIP Filed April 21, 1926 2 Sheets-Sheet 2 INVENTOR GflMon yomewy ATTORNEYS.

Patented Apr. 5, 1927.

UNITED STATES PATENT. OFFICE.

GUSTAVUB A. MONTGOMERY, OF TITUSVILLE, PENNSYLVANIA.

CASING sLIr.

Application filed April 21, 1926. Serial No. 103,579.

This invention relates in general to grip- 0 groups or nests to prevent any one slip from falling down into the well and jamming the the liner or facmg looking at the mner face casing or interfering with the drilling, in which the slips of each group are organized and assembled in a novel and advantageous manner so that the parts best adapted to take the strains bear the strains and so that the slips, while held in proper assembly, have the desirable freedom of movement.

A further object resides in the provision of a novel slip construction made up of'separate body and liner or facings of such a character that the slip is of minimum weight to facilitate handling, and yet resents a relatively great area of the ipe w ereby the allowable unit pressure on the pipe is not exceeded. In carrying out this feature, the slips have liners or facings which are of greater area than the body, the liner: or feelng preferably being of greater length than the body. a

Another object resides in the provision of a slip of the type which has a separate liner i of Figure 2,

made of high grade steel and a body of a less expensive rade of steel and in which the liner is positively, securely and firmly mounted on its body in such manner that it may be readily released and replaced.

Other objects and advantages reside in certain novehfeatures of the construction, arrangement and combination of parts which will be hereinafter more fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawings forming a part of this specification, and in which:

Figure 1 is a plan view of the casing slip embodying the present invention,

Figure 2 is asectional view on the line 2-2 of Figure 1,

Figure 3 is a. view in horizontal section on the line 3-3 of Figure 2, I

Figure 4 is a similar view on the line 44 Fi re 5 is a view in vertical section on the hne 5-5 of Figure 1,

Figure 6 is a similar view on the line 6-6 of Figure 1,

Figure 7 is a view in section on the line 7' -7 of Figure 1,

Figure 8 is a detail perspective view of the body of one of the slips,

Figure 9 is a detail view in plan of the liner or facing of one of the slips,

Fi re 10 1s a detail perspective view of thereof, and

Figure 11 is an enlarged fragmentary sectional view showing the springpressed locking plunger.

Referring to the drawings, it will be seen that the casing slip embodying the invention proposes at least two groups of sli s, one group being designated at G and t e other group being deslgnated at G. In the present embodiment of the invention three slips are shown in each group, but it is to be understood that the number of slips may be varied as may be desirable.

The corresponding slips of the two groups I are of identical construction. Each group has a center slip 1 and the end slips 2 and 3.

The slips 1, 2 and 3 are of identical construction except as will be hereinafter point ed out. -Each slip includes a body 4 and a separate lineror facing 5. The body 4 is cored out to lighten it, as indicated at 6.

The inner face of the body is provided with a transversely or circumferentially extending groove 7 having its upper and lower walls undercut as at 8. The liner 5 associated with the body is provided with a transversely or circumferentially extending i rib 9 having undercut upper and lower ed s 10 which snugly engage the undercut wa ls 8 of the groove 7, the rib 9 being slipped sidewise into the roove 7. The interengagement of the llb 9v and groove 7 locks the liner to the body against all except circumferential movement. Means is provided for releasably locking the liner against circumferential movement, and comprises a locking plunger 11 freely slidable in an opening 12 provided therefor in the body. A spring 13 is associated with the plan er 11 to force the same outwardly toward ghe liner. The outer end of the plunger is tapered, as indicated at 14, and this tapered end of the plunger is receivable in a correspondingl shaped opening 15 formed in the liner 5 an extending therethrough as shown in Fig. 11, so that when it is desired to separate the liner from the body the plunger may be ushed back into socket 12 with any suita le tool. When the liner 5 is properly centered on the body, its 0 ening 15 1s alined with the plunger 11 an the spring 13 forces the plunger 11 into the opcmng15 to lock the liner on the body.

By forming the liner and body separate, the liner may be constructed of high-grade steel and the relatively heavy body may be constructed of a less expensive grade of steel. -Moreowr. as the liner is of uniform thickness throughout. it will temper better than if it is formed integral with the body, since the body must have a taperto coact with the tapered ring or bushing with which it is employed in practice.

Another important feature of the present invention resides in the provision of .a liner which is longer than the body, as clearly shown in the drawings. This has the advantage of distributing the gripping force over a relatively great area on the pi e, while leaving the entire slip structure re atively light and compact so that it may be readly handled, an important advantage when it is considered that these slips must be handled hundreds of times daily by manual labor. Another important advantage which results from this feature resides in the fact that the allowable unit pressure of the pipe is not exceeded. It is to be understood that this allowable unit pressure on the pipe is limited, and if it is exceeded the slips will bend or collapse the pipe.

Each of the central slips 1 has adjacent its inner corners vertically spaced semi-cylindrical projections 20 and 21, and in between these semi-cylindrical projections 20 and 21, a semi-cylindrical depression 22 is provided as illustrated to advantage in Figures 7 and 8. The portions of the slips 2 and 3 located adjacent the central slips are provided with semi-cylindrical depressions 23 and 24 receiving the projections20 and 21, and between the depressions 23 and 24, semicylindrical projections 25 are provided, the

projections 25 fitting in the depressions 22. As shown in Figure 7, the vertical extent of each projection 25 is such in relation to the vertical extent of its depression 22 that a clearance space 26 is formed. The projections 20, 21 and 25 are held in their depressions 23, 24 and 22 against lateral displacement only by means of U-bo1ts designated generally at 27, each U-bolt having legs 28 and 29 and abody portion 30 connecting the legs. The body of the central slip is provided with vertical openings 31 adjacent the projections 20 and 21, and the recesses 22, and these openin s 31 receive the legs 29 of the U-bolts 27. T e bodies of the slips 2 and 3 have openings 32 formed therein adjacent the depressions 23 and 24 and the projections 25 thereof, the o enin 32 receiving the legs 28 of the U-bo ts. djacent their lower ends the openings 31 and 32 are enlarged laterally to extend out through the adjacent sides of the slips, and these openings are slightly larger than the body portion 30 so as to not only accommodatethe body portion of the U-bolt but also to provide the requisite clearance necessary to the operative movement of the slips. Each of the openings 31 is countersunk at ts upper end, as indicated at 33. The openlngs 32 are also counter-sunk at their upper ends as indicated at 34, the counter-sinks 34 belng somewhat deeper than the countersmks 33. Near the counter-sinks 33 and 34, slots 35 and 36 are provided. In the countersinks 33 and 34 and in the slots 35 and 36 links 38 are received, the links having openings receiving the upper ends of the legs,

of the U-bolts.

The links 38 are held on the legs of the U-bolts by means of castellated nuts 40 and other nuts 41, the nuts 40 being threaded on the legs 28 and the nuts '41 being threaded on the legs 29. The castellated nuts 40. are held in position by the 'usual cotter pin. The nuts 41 are in the form of cap nuts with their upper ends transversely slotted as at 42 to provide bifurcated portions in whieh eyes 43 of bail-like o1.- handle members 44 are received. Pivot pins 45 are provided to pivotally connect the eyes 43 of the bails or handles 44 to the cap nuts. The links and U-bolts hold the projections 20, 21 and 25 in their recesses 23, 24 and 22. and the U-bolts and links take the lateral strains, but neither the u-bolts or the links are subjected to vertical strain, since the projection 25 positively engages the projections 21 or 20 to take 'up such strain. As the countersink 34 is deeper than the counter-sink 33 it provides a clearance necessary to relieve the links 38 of vertical strains.

I claim 1. A casing slip comprising a tapered body adapted to be mounted on the tapered inner wall of the spider for free sliding movement, and a liner fixed to and longer than the body and held against longitudinal inoven'icnt relative to 4110 body, said liner having pipe-engaging means throughout its extent to present a gripping surface of relatransversely extending rib on the liner, the

body having a groove in which said rib 5; snugly titted whereby the liner is fixed to the body against all except. transverse movement, and rel unable means for locking the rib and liner against transverse movement in the groove.

3. A casing slip comprising a tapered body adapted to be mounted on the inner tapered wall of a spider for free sliding movement and a separate liner at leastas long as the body, interlocking means between the liner and the body including a transversely extending undercut rib on the. liner, the body having a similar groove in which said rib is snugly titted whereby the liner is fixed to the body against all except transverse movement. and releasable means for locking the rib and liner against transverse movement in the groove.

4. A casing slip comprising a tapered body adapted to be mounted on the inner tapered all of a spider for free sliding movement having a circumferentially extending 'roove provided with undercut upper and ower edges, :1 separate slip at least as long as the body and having a circumferentially extending rib provided with undercut upper and lower edges simultaneously snugly engageable with both correspondingly formed edges of the groove of the body, whereby the liner is fixedly secured to'the body against all except circumferential movement and means for locking the slip against circumferential movement relative to the body.

5. A casing slip comprising a body having a circumferentially extending groove provided with undercut upper and lower edges, a separate slip at least as long as the body and having a circumferentially extenc ing rib provided with undercut upper and lower edges engageable with the correspondingly formed edges of the groove of the body, and means for locking the slip against circumferential movement relative to the body, and comprising a spring pressed plunger mounted on the body, the slip having an opening into which the plungeris projected.

6. A casing slip comprising a body having acircumferentially extending groove provided with undercut upper and lower edges, a separate slip having a circumferentially extending rib provided with undercut upper and lower edges engageable with the correspondingly formededges of the groove of the body. and means for locking the slip ,against circumferential movement relative to the body, and comprising a spring pressed plunger mounted on the body, the slip having an opening into which the plunger is projected, the opening of the slip and the engaging portion of the plunger bcing correspondingly tapered.

7. A casing slip comprising a tapered body adapted to be mounted on the inner tapered wall of a spider for free sliding movement, a separate liner longer than the body and projecting above and below the same, and interlocking means between the liner and the body for fixedly securing the liner to the body.

8. A device of the character described, comprising a plurality of easing slips having, mterengaging means on their lateral edges permitting relative pivotal movement of the slips, and means separate from and independent of the interengaging means for holding'the iuterengaging means against lateral displacement only relative to each other. 1

9. A device of the character described, compris ng a plurality of easing slips hav-" ing interengaging means on their lateral edges permitting relative pivotal movement of the slips, and means for holding the intereugaging means against lateral displacement relative to each other. andconsisting of U-- bolts, the slips having open ngs receiving the legs of the U-bolts and accommodating the bodies thereof. I

- 10. A device of the character described, comprising a plurality of easing slips having interengaging means on their lateral edgespermitting relative pivotal movement of the slips, and means for holding the "in-' terengaging means against lateral displacement relative to each other, and consisting of U-bolts, the slips having openings receiving the legs of the U-bolts and accommodating the bodies thereof, links connecting the legs of each U-bolt, the slips having openings receiving the links, and nuts threaded on the upper ends of the legs to hold the links and U-bolts in position.

11. A device of the character described, comprising a plurality of easing slips having interengaging means on their lateral edges permitting relative pivotal movement of the slips, and means for holding the interengaging means against lateral displacement relative to each other and consisting of U-bolts, the slips having openings receiving the legs of the U-bolts and accommodating the 'bodies thereof, links connecting the legs of each U-bolt, the slips having openings receiving the links, nuts threaded on the upper ends of the legs to hold' the links and U-bolts in position, and handle members connected to certain of said nuts.

12. A device of the character described, comprising a plurality of easing slips having interfittmg projections and depressions valong their adjacent lateral faces, the projection snugly fitting in the depressions the projections and depressionsbeing provided "with rounded vertical peripheries to provide vertical hinges only between the slips, and means for holding the projections, and depressions engage 13. A device of the character described, com irising a plurality of casing slips having mterfitting projections and depressions along their adjacent lateral faces, the rojections and depressions being rounde to rovide hinges between the slips, means for 101 ing the projections and depressions ena' ed, and comprising U-bolts and means for holding the U-bolts against displacement.

14. A device of the character described, comprising a plurality-oflcasing slips having interfittin projections and depressions along their adjacent lateral faces, the projections and depressions being rounded to rovide hinges between the slips, means for olding the projections and depressions cngaged and comprising U-bolts pivotally interfitted with the slips, links connecting the legs of the U-bolts and also engaging the sh s, and nuts threadedly engaged with-the U-Eolts for ireventing displacement of the links and U- olts.

. 15. A comprising a plurality of easing slips having interfitting projections and depressions along their adjacent lateral faces, the projections and depressions being rounded to rovide hinges between the slips, means for liolding the projections and depressions engaged and comprising U-bolt-s pivotally intel-fitted with the slips, links connecting the legs of the U-bolts and also engaging the sh s, nuts threadedly enga ed with the U- bolts for preventing disp acement of the device of the character described,-

links and U-bolts, and bail-like handle membeis pivotally connected to certain of the nu s.

16. A device of the character described,

comprising a plurality of easing slips h'aving inter-fitting projections and depressions along their adjacent lateral faces, the rejections and depressions being rounde to provide hinges between the slips, means for holding the projections and depressions engaged including .U-bolts pivotally interfitted with the slips, links having pivotal connection with the legs ofthe U-bolts, the slips having openings receiving the links, means for holding the links and U-bolts in position, there being clearance between the links and certain of the slips and a clearance between certain of the projections to relieve the links and U-bolts of vertical strain.

17. In a device of the character described, comprising a plurality of groups of easing slips, each group of easing slips including a central slip and a pair of end slips, the central slips having along each of its inner lateral edges spaced semi-cylindrical and laterally directed projections, there being a.

semi-y indrical recess between the pro ections of each edge of the centralshp, the

end slips having corresponding recesses and I projections in which the recesses and projections of the central slip are fitted, and means for holding the projections of the slips operativey engage GU TAVUS A. MONTGOMERY. 

